According to the book "Keris Jawa" or the EK, dapur Balebang includes 7 waves (or possibly 5 according to the EK). As this blade has 9 waves I would rather identify its dapur type as Sempana Robyong (greneng above the kembang kacang). Dapur Balebang also icludes a twin sogokan unlike this blade.
Regards
Thank you, Jean. What is “the EK” that you refer to?